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Chapters
2: Classical Genetics
3: Chromosomal Basis of Inheritance
4: Principles and Processes of Biotechnology
5: Plant Tissue Culture
6: Principles of Ecology
7: Ecosystem
▶ 8: Environmental Issues
9: Plant Breeding
10: Economically Useful Plants and Entrepreneurial Botany
![Samacheer Kalvi solutions for Biology (Botany) [English] Class 12 TN Board chapter 8 - Environmental Issues - Shaalaa.com](/images/biology-botany-english-class-12-tn-board_6:5f2b1b2038084cf381bfa42c826a928c.jpg "Samacheer Kalvi solutions for Biology (Botany) [English] Class 12 TN Board chapter 8 - Environmental Issues")
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Solutions for Chapter 8: Environmental Issues
Below listed, you can find solutions for Chapter 8 of Tamil Nadu Board of Secondary Education Samacheer Kalvi for Biology (Botany) [English] Class 12 TN Board.
Samacheer Kalvi solutions for Biology (Botany) [English] Class 12 TN Board 8 Environmental Issues Evaluation [Pages 168 - 169]
Which of the following would most likely help to slow down the greenhouse effect.
Converting tropical forests into grazing land for cattle.
Ensuring that all excess paper packaging is buried to ashes.
Redesigning landfill dumps to allow methane to be collected.
Promoting the use of private rather than public transport.
With respect to EichhorniaWith respect to Eichhornia
Statement A: It drains off oxygen from water and is seen growing in standing water.
Statement B: It is an indigenous species of our country
Statement A is correct and Statement B is wrong.
Both Statements A and B are correct.
Statement A is correct and Statement B is wrong.
Both statements A and B are wrong.
Find the wrongly matched pair.
Endemism - Species confined to a region and not found anywhere else.
Hotspots - Western ghats
Ex-situ Conservation - Zoological parks
Sacred groves - Saintri hills of Rajasthan
Alien sp. Of India - Water hyacinth
Depletion of which gas in the atmosphere can lead to an increased incidence of skin cancer?
Ammonia
Methane
Nitrous oxide
Ozone
One green house gas contributes 14% of total global warming and another contributes 6%. These are respectively identified as
N2O and CO2
CFCs and N2O
CH4 and CO2
CH4 and CFCS
One of the chief reasons among the following for the depletion in the number of species making endangered is
over hunting and poaching
green house effect
competition and predation
habitat destruction
Deforestation means
growing plants and trees in an area where there is no forest
growing plants and trees in an area where the forest is removed
growing plants and trees in a pond
removal of plants and trees
Deforestation does not lead to
Quick nutrient cycling
soil erosion
alternation of local weather conditions
Destruction of natural habitat weather conditions
The unit for measuring ozone thickness
Joule
Kilos
Dobson
Watt
People’s movement for the protection of the environment in Sirsi of Karnataka is
Chipko movement
Amirtha Devi Bishwas movement
Appiko movement
None of the above
The plants which are grown in silivpasture system are
Sesbania and Acacia
Solenum and Crotalaria
Clitoria and Begonia
Teak and sandal
What is ozone hole?
Give four examples of plants cultivated in commercial agroforestry.
Expand CCS.
How do forests help in maintaining the climate?
How do sacred groves help in the conservation of biodiversity?
Which one gas is most abundant out of the four commonest greenhouse gases?
Discuss the effect of this gas on the growth of plants?
Suggest a solution to the water crisis and explain its advantages.
Explain afforestation with case studies.
What are the effects of deforestation and the benefits of agroforesty?
Solutions for 8: Environmental Issues
Samacheer Kalvi solutions for Biology (Botany) [English] Class 12 TN Board chapter 8 - Environmental Issues
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Concepts covered in Biology (Botany) [English] Class 12 TN Board chapter 8 Environmental Issues are Forestry, Alien Invasive Species, Conservation, Geographic Information System, Deforestation and Its Causes, Greenhouse Effect and Global Warming, Afforestation, Carbon Capture and Storage (CCS), Rain Water Harvesting – RWH (Solution to Water Crisis – a Ecological Problem), Environmental Impact Assessment (EIA).
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